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The trailing edge phase control principle is suitable for all incandescent lamps and loads with
capacitive input behaviour, e.g. electronic transformers.
There are also LED laps that are only suitable for the trailing edge phase control principle. For
example, these are lamps that have a capacitor on the input side (e.g. for radio interference sup-
pression). If this is discharged, it acts like a short-circuit for a short time during the switching on.
This effect would produce high current peaks for leading edge phase control due to the steep
switch-on edges.
4.3.5 Installation-related power reduction
In addition to the basic compatibility of the lamps and, if necessary, of the ballasts, the planned
installation position must also be taken into account.
As dimmers develop a higher power loss than relays, particular attention must be paid to the
occurring heat for the power loss. The occurring heat must be reliably dissipated to prevent
damage. The heat is usually dissipated into the wall via the support plate. If this is not possible
because the dimmer is installed, for example, in a surface-mounted box or in a cavity wall box in
plasterboard stud frame, the rated load must be reduced.
Rules for reduction of the rated load
In the case of increased ambient temperature
Reduction by 10% for each 5 °C exceedance of the ambient temperature above 25 °C.
Example : Installation of a dimmer with 500 watts in an ambient temperature of 40 °C
40 °C – 25 °C = 15 °C
15 °C / 5 °C = 3
3 x 10 percent = 30 percent
Reduction of the rated load by 30 percent
The 500 W dimmer may only be loaded with 70 percent of the specified rated power,
i.e. with
350 W .
For installation in cavity, plasterboard or wooden wall, for installation in furniture
Reduction by 15 percent.
Example : Installation of a dimmer with 500 watts in a cabinet wall
Reduction of the rated load by 15 percent
The 500 W dimmer may only be loaded with 85 percent of the specified rated power,
i.e. with
425 W .
LB MANAGEMENT LIGHT 91